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Old 11-07-2010, 01:53 PM
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Piston Question

I have a set of forged pistons that I received from the manufacture all facing the same directions. By that I mean if you were to put them all in the engine 4 would be correctly facing the front of the engine as marked on the piston and the other 4 would be facing the rear of the engine. They are offset pin pistons but from the looks of it the pin offset would be the same when installed. Would you guys use these pistons in your build? Thanks

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Old 11-07-2010, 06:02 PM
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What motor are you working on and what brand pistons?

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Originally Posted by 803Paul
I have a set of forged pistons that I received from the manufacture all facing the same directions. By that I mean if you were to put them all in the engine 4 would be correctly facing the front of the engine as marked on the piston and the other 4 would be facing the rear of the engine. They are offset pin pistons but from the looks of it the pin offset would be the same when installed. Would you guys use these pistons in your build? Thanks
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Old 11-07-2010, 06:07 PM
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If the pin offset comes out right you are good to go, ignore what it says on the piston tops.

A little known(or maybe known more than I think, at least to some of us who have been around) "speed secret" is to install the pistons with the pin offset opposite of the factory orientation, adds a slight leverage advantage to the rod/crank at TDC. Only downside is the engine might be a little noisier when cold due to piston skirt slap, but no problem when warm.
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Old 11-07-2010, 06:52 PM
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The pistons are FPS series Probe 12cc dish
The motor is a 383 chevy
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Old 11-07-2010, 10:52 PM
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As long as they are installed in the same offset configuration from left bank to right just put them in and forget the factory marking, I'm assuming you got a deal on them because they were mismarked.

I love those kinds of deals!
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Old 11-08-2010, 11:37 AM
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Yes, I got a deal. Matter of fact they sent me the "new" design piston for free. So I have a spare set of 12cc dish forged pistons and spiro locks. I guess I got lucky on this one.
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